Organic electroluminescent compound and organic electroluminescent device comprising the same

An organic electroluminescent compound represented by the following formula 1:

• wherein
• B1 to B7, each independently, are not present or represent a substituted or unsubstituted (C5-C20) ring, in which the carbon atom of the ring may be replaced with one or more heteroatoms selected from nitrogen, oxygen and sulfur;
• with the proviso that at least five of B1 to B7 are present, and the adjacent rings of B1 to B7 are fused with each other;
• Y represents —N-L1-(Ar1)n, —O—, —S—, or —CR1R2;
• L1 represents a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene;
• Ar1 represents a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or —NR3R4;
• R1 to R4, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl;
• or may be linked to an adjacent substituent(s) to form a ring(s);
• and
• n represents an integer of 1 or 2;
• where if n represents 2, each of Ar1 may be the same as or different from each other.